Multi Threaded extension of David Blei's LDA implementation in C. Speeds up the computation by orders of magnitude depending on the number of processors. The tar bundle contains a README file with usage instructions.

Described in Parallelized Variational EM for Latent Dirichlet Allocation: An experimental evaluation of speed and scalability. Ramesh Nallapati, William Cohen, John Lafferty,ICDM workshop on High Performance Data Mining, 2007 [pdf][ppt]